The S5 Box is great for a login module, small note regarding site information or really anything you can think to publish to the S5 Box. Powered by S5 Effects, so you won't receive any script conflictions.
To Setup The S5 Box:
The Joomla module position for this box is "toolbar" just publish your modules to this position and the little tab will show up on your website. You can also define what text is in the tab via the index.php in Joomla 1.0.x or in Joomla 1.5 the template parameters.